AN astonishingly quiet art exhibition is currently on view at the Winchester Cultural Center's gallery space. Called Drift, the show features the work of Leah Craig and Janet Greek. Both artists are UNLV alumnae, and Craig is on her way to pursuing an MFA at Tufts University in Boston this fall. In vastly different ways, both artists appear to give visual representation to certain transitory moments in time -- moments so interstitial or so peripheral to what we perceive to be relevant that the very reality of one's existence can be called into question.